The Ultimate Horticulture Lighting Group HLG 300 V2 Review

Are you planning to start a growing business, but worried because of the small area you have in your place and thinking that there’s no competent LED grow light that would suffice your dream growing business? Drop all your worries now because the Ultimate Horticulture Lighting Group has something for you! Introducing the HLG 300 V2, the most efficient LED grow light that able to cover your 3' x 3' grow area.

In a very small 3'x3' space, you can already start your growing business just tune your green thumb by learning this craft. Just a reminder! Don’t ever waste too much electricity and spend much dollars in purchasing many products for your set-ups, as well as, don’t be easily hooked by companies’ marketing tactics selling you bright colors on fancy labels products.

In addition, keep in mind that you don’t need to go with the trend always thus, it’s not necessary to do what everybody does like always getting and buying the newest thing in the stores.  You just keep it simple!

Moreover, if you are still a beginner in this industry and wanted to maximize your little spaced-area then, you must grab the Horticulture Lighting Group HLG 300 V2 for lighting. This fixture is a high-intensity full spectrum white LED and it is incredibly equivalent to a 500–600-watt HPS. Take note that it uses almost 50% electricity and practically produces no heat, unlike HPS who always have heat issues when growing.

Another amazing thing about HLG 300 is that it’s absolutely perfect for a 3'x3' sq. ft. area and only draws 280 watts at the wall. If you’re doubting this product due to its small size to cover your area then don’t be!  Because this grow light will surely surpass any other 280 watt LEDs that are line-up on the market. Did you know that HLG 300 is the little sister of the HLG 550, Horticulture Lighting Group’s true 1000 watt HPS SE replacement? You heard it right! So why doubt on this credible and high-end product?

Now that you already have a background of the features of this powerful light, the next question is how about your air? Do you have air flow and have high humidity? Check the table below to guide you about this issue:

Optical Humidity 

REMINDER: too much moisture leads to mold, bud rot, and mildew. Remember to always make sure that there’s a breeze moving over and under plants. If possible, keep humidity low as plants approach harvest.

In your case, since you are using a lot less heat with the HLG 300 vs a 600-watt HPS, humidity levels can spike and take note that if these levels are constantly above 60%, you’re required to use a dehumidifier.

For instance, you’re in a sealed closet or you are exchanging air in your small 3x3' space and you end up using a dehumidifier. Don’t worry because you’re in good shape. Why? Because Cause with high intensity LED white light engines like the HLG 300 and HLG 550, you’re really want to run temperatures higher than HPS. But in situations when you run using a dehumidifier, it will help you a lot in letting heat up your grow room since it produces a little heat.

If you’re worried because you don’t have a dehumidifier at home, it’s alright to use other alternatives to raise the temperatures you can have a small space heater or you can seal your room up longer periods in-between air exchanges.

Lastly, another crucial thing when running high intensity LED grow lights like HLG 300 v2 is the temperature. So remember that you must ensure temperatures in your grow room to be 83–87 degrees (28–30 C.)

Why you should take note the mentioned temperatures?

It’s because when running a 1000watt HPS for example, you’re already producing 4,000 BTU’s of heat and high intensity lighting to your flowers. What will happen is that the flowers will stretch a little, giving space in-between the cell walls, as they grow in order to let them “breathe”. If you will follow a 78 degree temperature at an HPS garden it will guarantee you to have a dense and good size results to your flowers.

Lastly, how will you manipulate a high intensity LED garden? All you need to do is to run your grow room at 85-ish degrees (29 C.) This will make the flowers to swell and expand in order form them to “breathe”, causing space in between the cell walls for beautifulness, instead of having the cell walls grow right on top of each other and right next to each other.


  • Wattage draw: 120-285 watts (dimmable on driver)
  • HID equivalent: 500-600 watts
  • LEDs: 576 x Top-Bin Samsung LM301B diodes
  • Light Output: 627 PPF
  • System efficiency: 147 Lm/W
  • Par efficiency: 2.2 umol/J
  • Mounting height: 15-24"
  • Thermal management: Passive cooling
  • Dimensions: 18” x 20” x 3”
  • Operating/input voltage: 90-277VAC; 50Hz-60Hz
  • Amperage: ~2.3 @ 120V; ~1.18A @ 240V
  • Finish: Clear anodized aluminum

Coverage Area

  • Veg: 4' x 4'
  • Flower: 2.5' x 2.5' to 3' x 3'

Package Includes

  • Fixture w/ 120V plug (UK, AU, or EU cord available on request)
  • Dimmable driver (dimmable to 50% light intensity)

This product is recommended for:

  • Grow tents
  • Grow rooms
  • Small indoor grows
  • Supplemental lighting
  • Vegetative growth and/or flowering
  • Full-cycle growing from seedling to flower
  • Soil, hydroponic, aeroponic, or aquaponic systems
  • Manufacturer's warranty: 3-years



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